DB1-Z16 KR24 Rotary Hook for Singer 20U Zig-Zag Industrial Sewing Machine

The DB1-Z16 / KR24 rotary shuttle hook provides a precision replacement solution for compatible industrial zig-zag sewing machines, including Singer 20U-class machines and selected Juki, Brother, Adler, Consew, SunStar and other 20U-style models. The hook catches the upper thread loop smoothly and supports consistent lockstitch formation during industrial sewing.

This industrial rotary hook assembly features a 16 mm needle-slot profile and comes as 1 precision hook unit. It suits machine repair, routine maintenance and replacement when the existing hook shows wear, damage, rough rotation or inconsistent thread-loop catching.

What Is the DB1-Z16 KR24 Rotary Hook Used For?

The rotary hook works with the bobbin system and catches the upper thread loop as it rotates around the bobbin area. Proper hook operation helps maintain stable stitch formation and smooth sewing.

The DB1-Z16 / KR24 hook supports compatible industrial zig-zag and lockstitch applications. You can use it for garment stitching, decorative zig-zag work and general sewing when the machine matches the specified hook configuration.

Key Features

• Model: DB1-Z16 / KR24
• Type: Industrial rotary shuttle hook
• Needle Slot: 16 mm
• Pack Quantity: 1 Piece
• Construction: Precision stainless-steel hook unit
• Application: Compatible industrial zig-zag and lockstitch sewing machines
• Use: Replacement, repair and machine maintenance
• Cross-Reference Numbers: 541674, B18300270A0, 117677-901 and KR23-16 as supplied for this product

The hook profile helps catch the thread loop smoothly and maintain stable rotary movement. Its precision-machined construction supports continuous sewing when you install and time the hook correctly.

Machine Compatibility

The DB1-Z16 / KR24 hook works with several 20U-style and industrial zig-zag sewing machine applications.

Compatibility listings for DB1-Z16 include Singer 20U-class, Juki LZ-series, Brother, Adler, Consew and SunStar models.

Please verify the shape, needle-slot profile and measurements of your existing hook before purchasing, especially when replacing a hook on a generic 20U-style machine.

Best Fabric Types

This rotary hook supports compatible machines that sew a broad range of materials, including:

• Cotton: Suitable for general garment and tailoring work.
• Polyester: Suitable for common synthetic fabrics and apparel stitching.
• Denim: Suitable when your sewing machine and needle setup support denim.
• Canvas: Useful for compatible industrial applications involving heavier woven materials.
• Sailcloth: Suitable for compatible 20U-style industrial zig-zag applications.
• Leather goods: Suitable when your machine, needle, thread and presser-foot setup support leather.

The hook itself does not determine fabric capacity. Your machine, needle, thread, presser foot and complete sewing setup must also match the material.

How To Use

1. Switch off and disconnect the sewing machine before starting replacement work.
2. Remove the required needle, bobbin and existing hook components according to the machine manual.
3. Clean lint, thread pieces and old lubricant from the hook area.
4. Install the DB1-Z16 / KR24 hook in the correct orientation.
5. Check the hook, needle and bobbin-area clearance before rotating the machine by hand.
6. Set the hook timing according to the sewing machine manufacturer’s specifications.
7. Refit the needle and bobbin components.
8. Turn the handwheel slowly and check for smooth movement and correct thread-loop catching.
9. Test sew on a suitable fabric scrap before returning the machine to production.

Correct installation and hook timing help prevent skipped stitches, needle contact and thread problems.

Why Replace a Worn Rotary Hook?

A worn or damaged sewing hook can affect thread-loop catching and stitch formation. Inspect the hook if you notice rough rotation, visible damage around the hook point, repeated thread problems, skipped stitches or unusual contact between the needle and hook.

Replace the worn component with the correct DB1-Z16 / KR24 rotary hook when the existing part reaches the end of its service life. The correct replacement can help restore the hook-and-bobbin mechanism and support consistent sewing performance.

Frequently Asked Questions

What is a DB1-Z16 rotary hook?

The DB1-Z16 is a rotary hook for compatible industrial zig-zag sewing machines. It rotates around the bobbin area and catches the upper thread loop to help form the lockstitch. This version uses the KR24 configuration and a 16 mm needle-slot profile.

Does the DB1-Z16 KR24 fit Singer 20U?

Yes, it works with compatible Singer 20U-class machines, including several 20U variants. Compare the hook configuration with your original part before ordering because different 20U-related machines may use different hook specifications.

Does this rotary hook fit Juki LZ-271?

Yes, the DB1-Z16 hook works with Juki LZ-271 and related LZ-series machines. Other documented applications include Juki LZ-27, LZ-29, LZ-40 and LZ-403. Verify your existing hook configuration before installation.

What is the needle slot size?

The product uses a 16 mm needle-slot profile. Compare the slot and overall hook configuration with your existing part before purchasing to help confirm compatibility.

Is this hook suitable for zig-zag sewing?

Yes. The DB1-Z16 / KR24 supports compatible industrial zig-zag sewing machine applications. It performs the rotary hook function that catches the upper thread loop during stitch formation.

Can I use this hook for denim or canvas?

Yes, when your sewing machine supports the material. The hook handles the machine’s stitch-forming function, while fabric thickness depends on the complete machine setup, including needle, thread, presser foot and machine specifications.

How do I know if I need to replace the rotary hook?

Inspect the hook when you notice repeated thread-catching problems, skipped stitches, visible hook-point damage, rough rotation or needle-to-hook contact. Confirm the correct replacement specification before installation.

Is DB1-Z16 the same as every KR24 hook?

No. KR24 identifies a hook configuration or reference, while rotary-hook variants can have different dimensions, profiles and machine applications. Match the part number, hook shape, needle-slot specification and machine model before ordering.